Android经典Exception汇总

1，android.view.WindowManager$BadTokenException: Unable to add window — token android.os.BinderProxy@447a6748 is not valid; is your activity running?

1.1 exception详情：

android.view.WindowManager$BadTokenException: Unable to add window — token android.os.BinderProxy@447a6748 is not valid; is your activity running?
at android.view.ViewRoot.setView(ViewRoot.java:468)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
at android.view.Window$LocalWindowManager.addView(Window.java:424)
at android.app.Dialog.show(Dialog.java:239)
at android.app.Activity.showDialog(Activity.java:2488)
…
at android.os.Handler.dispatchMessage(Handler.java:99)
…

1.2 exception分析：

此Exception通常出现的场景是：在子线程中通过handler回到主线程执行Dialog.show()的时候，dialog所属的Activity正在finish过程中

1.3 exception解决：

显示dialog的时候判断activity的finish状态

if (!activity.isFinishing()) {
dialog.show();
}

1.4 参考：

http://dimitar.me/android-displaying-dialogs-from-background-threads/

2，Gradle sync failed: ‘xxxx’ already disposed

2.1 解决方案：

./gradlew clean

Restart Android stduio